Method and apparatus for protecting a polarity sensitive load
a polarity sensitive load and protection device technology, applied in reverse polarity correction, safety/protection circuits, transportation and packaging, etc., can solve the problems of high heat generation, damage to polarity sensitive loads, and high cost of design and manufacturing, and achieve the effect of less cost and more efficien
Active Publication Date: 2019-06-18
LITTELFUSE INC
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- Description
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- Application Information
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Benefits of technology
The patent describes a circuit protection device that protects sensitive loads from damage caused by incorrect polarity in DC power circuits. The device includes a power source, a relay, and a diode. When the power source provides the expected polarity, the diode blocks the current from flowing to the relay, allowing the relay to provide a current path to the load. When the power source provides the incorrect polarity, the diode allows the current to flow to the relay, which then disrupts the current path to the load, protecting the sensitive load from damage. The device is efficient and cost-effective to design and manufacture.
Problems solved by technology
When the polarity sensitive load is provided with a DC voltage and / or current of an incorrect or reverse polarity, the polarity sensitive load may be damaged or may operate incorrectly.
As a result of the significant voltage drops, considerable amounts of heat can be generated.
Consequently, such conventional power circuits often require high power circuit protection devices such as, for example, high power diodes.
These high power diodes can increase costs and the heat dissipated by such high power diodes can increase manufacturing and design costs due to the need for thermal management.
Method used
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[0015]The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown. This disclosure, however, may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. In the drawings, like numbers refer to like elements throughout.
[0016]FIG. 1 illustrates a conventional circuit 100 for protecting a polarity sensitive load. The conventional circuit 100 can include a power source 102, a polarity sensitive load 104, and a diode 106. As shown in FIG. 1, the diode 106 can be placed in series with the polarity sensitive load 104. The power source 102 can be a direct current (DC) power source such as, for example, a battery. The polarity sensitive load 104 can represent a load that can ...
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Provided herein are improved apparatuses and methods for protecting polarity sensitive loads in DC power circuits that include a power source, a relay coupled to the power source, and a polarity sensitive load coupled to the relay. A diode can be coupled between the power source and the relay. When the power source provides a DC voltage of a desired polarity, the diode can block a current from flowing to a coil of the relay. Consequently, the relay can provide a current path to the polarity sensitive load. When the power source provides a DC voltage of an incorrect or reverse polarity, the diode can allow a current to flow to the coil of the relay. In turn, the coil of the relay can be energized, causing the relay to disrupt the current path provided to the load, thereby protecting the polarity sensitive load from the reverse polarity condition.
Description
FIELD OF THE DISCLOSURE[0001]This disclosure relates generally to the field of circuit protection and, more particularly, to reverse polarity protection of power circuit devices.BACKGROUND OF THE DISCLOSURE[0002]Direct current (DC) power circuits often include polarity sensitive devices or loads. Polarity sensitive loads, in general, are designed to operate properly when provided with a DC voltage and / or current of an expected or desired polarity. When the polarity sensitive load is provided with a DC voltage and / or current of an incorrect or reverse polarity, the polarity sensitive load may be damaged or may operate incorrectly. A polarity sensitive load may be provided with a DC voltage and / or current of an incorrect or reverse polarity when a power source such as, for example, a battery is misconnected to a circuit containing the polarity sensitive load.[0003]Conventional power circuits having polarity sensitive loads often use protection devices and methods that introduce signif...
Claims
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IPC IPC(8): H02H3/18H02J7/00
CPCH02H3/18H02J7/0034H02H11/002
Inventor CRISPIM, BRIAN D.SCHWARTZ, GEOFFREY W.
Owner LITTELFUSE INC